[XB-49]

to your air.ini file, located, probably in \MODS\QMB_AVAILABLE_AIRCRAFT_FIX\com\maddox\il2\objects folder inside your IL-2 directory.

Actually, its usually located at C:\Program Files\Ubisoft\IL2 Sturmovik\MODS\STD\com\maddox\il2\objects. Great mod! I throughly enjoyed it.